Rock-drill.



No. 890,065. n PATENTED JUNE 9, 1908. M. KELLOW. ROCK DRILL. APPLoATIoN FILED APR.1.1907.

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PATENTED JUNE 9, 1908.

M. KELLOW.

. ROCK DRILL.

APPLIUATION FILED APR.1,1907.

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IN VEN TOR.'

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PATENTED JUNE 9, 1908.

M. KELLOW. ROCK DRILL. APPLICATION FILED AER. 1.1907.

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UNITED STATES PATENT oEErcE.

MOSES KELLOW, OF PENRHYNDENDRAETH, EGLAND.

ROCK-DRILL.

Patented June 9, 1908.

I Original application led November 9, 1906, Serial No. 342,686. Divided and this application led April 1, 1907.

Serial No. 365,798.

To all whom it may concern."

Be it known that I, MosEs KELLow, of the Park and Groesor Quarries, Penrhyndendraeth, in the county of Merioneth, North Wales, a subject of the King of Great Britain and Ireland, have invented certain new and useful Improvements in Power-Driven Rock- Drills, of which the following is a specification.

This invention, a division of my application iiled 9th November, 1906, Ser. No. 342686, relates to rock-drills of the type wherein a turbine or other small motor, is employed for rotating the drill.

The present invention consists in certain improvements in power drills of this class, particularly in the construction and mountlng of the turbine-wheel, in the means for feeding forward and withdrawing the drill, and in the construction of the casing.

ln the accompanying drawings, which illustrate a turbine-driven rock-drill embodyin my improvements, Figure 1 is a longitudina section of the machine, Fig. 2 a view of the rear end thereof, and Fig. 3 a vertical section, looking in the direction ofthe arrows on the line xin Fig. 1, showing the waterpassages for supplying water to the opposite sides of the piston in the piston cylinder, and Fig. 4 is a vertical section, taken on the line y-Jy in Fig. l,showing the passages between the two concentric cylinders and Fig. 5 a section on the line z-z in Fig. l.

According to my improved method of construction, the turbine-wheel A is housed in a chamber B formed as to one side by the wall of the gear-chamber C and as to the other side by a cover b attached to a plate D which is placed between the gear-case C and a rearplate E, the latter carrying the main watersupply-nozzle F hereinafter described. The turbine A is housed within its chamber B with just sufficient clearance to permit of its free working and the water, after impinging upon the vanes a2, plows through a passage b formed in the cover b of the wheel-chamber, and thence into the discharge-passage b2 in the casing.

The turbine A is mounted on or formed with .a sleeve a3 adapted to rotate `freely upon a casing G which partially incloses a drilltube H of hexagonal form throughout its length and capable of withdrawal through the back of the machine. This tube is r'urnished vat its outer extremity with a drill h,

while its inner extremity is furnished with a piston h', preferabl of hard wood, which works in a cylinder arranged concentrically within an outer cylinder fi: the latter forming 4an annular passage i around the inner cylinder. The\exterio r face of the inner cylinder is formed with a series of collars 'is displosed at intervals along its len th and which t closely within the outer cy inder to suport and stiiien the latter, channels fi being or'med for the passage of the water, as shown in Fig. 4. With the aid of a suitable flange and a nut i2 these cylinders are attached at their one end to the rear-plate E of the casing, while their opposite ends are closed by a suitably formed cap i3. By means of the nut i2 the cylinders are readily detached from'the casing for the insertion of drill-tubes of varying lengths, according to the depth of the hole required. Water under pressure is admitted by way of the passage f4 and the cock K to the annular passage i between the cylinders or to the interior of the cylinder l, according to whether it is desired to advance or to withdraw the drill. For withdrawing the drill the cock K is placed in the position shown in Fig. 3, communication being effected between the passages f* and a4, and between the 1passagesaf' and 115. In this position of the coc the Water flows from the passage ax* to a passage i in the face of the rear-plate E and thence passes into the cylinder l at the front of the piston h. When it is desired to advance the drill the cock K is turned so that the passage f4 is placed in communication with the passage t5, and the passage a4 in communication with the passage a5; water will now flow from the passage Q15 into a passage i* in the face of the rear-plate and thence by way of passages i7 and the annular passage i to the rear of the piston h. i

At the piston-end of the drill-tube H is mounted a spring-supported valve h adapted to admit water to an axial passage h3 in the drill-tube, whence it passes by way of passages v in the drill tothe extremity of the latter. The spring pertainin to the valve h2 is adjusted to permit of the atter opening at the pressure 'required for advancing the drill when boring; the said valve closing and shutting oli the water supply to the drill whBen the litter is n'ot worh'ng.

or su ying water to t e casing to operate the (iiill and for subsequently .discharging the same, I employ two concentric nozzles F F attached to the rear-plate E. The inner nozzle F serves to convey the water to the casing, while the outer nozzle F', which forms an annular passage f about the inner nozzle, serves as the outlet from the casing. To these nozzles hose-pipes f f2 are res ectively connected for the su ly E Pp and disc arge of the Water; the nozzles being connected together by means of concentric unions capable of being tightened by a single nut 7f3.

The su piy of water to drive the turbine is contro led, -independentiy of the supply which passes to the drill-piston, by means of a plug-cock J arranged in the inlet-passage F* in the rear-plate E, and adapted to open or close communication between the passage F* and a passage b4 which serves as a nozzle through which the water passes to drive the turbine. V

The passages for conveying the Water to and from the four-way cock are formed in the castings from Which the casing is built up; the passages being by preference formed in the faces of contiguous castings, so that when these are jointed together, complete passages are formed. Passages Z Z also communicate through the intervention of a cock L between the main-supply-passage f4 and a ressure-gage Z2 which is inclosed Within t e easingand serves to indicate the pressure of the Water in the passage The pressure lof the Water acting on the piston h may also be4 indicated by placing the passage l in communication with the passage af.

What I claim as my invention and desire tosecure by Letters Patent; is

1. In arotary rock-drill the combination, with a drill tube, a piston mounted at the rear extremity of said tube and a turbine wheel for rotating said tube, of a casing inclosing said turbine, two cylinders mounted concentrically at the rear of said casing so as angular peripheral surface and housed with- Y in said casing, a piston at the rear extremity of said drill-tube, and a machine casing comprising a front part forming the gear case', an intermediate part forming with the gear ease a turbine chamber, and a rear part formed with main supply and discharge passages and with vpassages for conveyin water to the rear and to the front of said drill-tube piston.

3. In a rotary rock-drill, the combination, with a turbine, gearing driven by said tur-4 bine and a drill-tube casinlgv rotated by said gearing, of a drill-tube ormed with an angular peripheral surface and housed Within said casing, a piston at the rear extremity of said drill-tube, a spring-controlled-valve mounted in said piston, and a machine casing comprising a front part forming the gear case, an intermediate part forming with the gear case a turbine chamber, and a rear part formed with mainsupply and discharge passages and with passages for conveying Water to the rear and to the front of said drill-tube piston.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

. MOSES KELLOW. Witnesses:

ALFRED N U'rTrNG, G. P. PHILLIPPS. 

